Electric light



March 16 1926. 1,577,151

R. c. ABELT, JR

ELECTRIC LIGHT Filed April 11, 1925 ATTORNEY Patented Mar. 16, 1926.

PATENT OFFICE.

RICHARD 0. 5.1311131, JR., ARGONNE, WISCONSIN.

ELECTRIC LIGHT.

Application filed April 11, 1925. Serial No. 22,412.

To all whom it may concern:

Be it known that I', RICHARD C. ABELT, Jr., a citizen of the United States, residing at Argonne, in the county of Forest and State of Wisconsin, have invented new and useful Improvements in Electric Lights, of which the following is a specification.

This invention relates to an electric light and has for its primary object the construc-' tion of'a light whereby the life thereof is prolonged.

An object of the invention is the construction of a light with duplex filaments, one of which may be rendered operative upon the burning out of the other.

A feature of my invention is the simple matter in which electrical connection can be made for running the second.

Fig. 1 is a side elevation of the electric light constructed in accordance with my invention.

Fig. 2 is an enlarged sectional view.

Fig. 3 is a similar view with the ends of the leads connected.

Fig. 4 is a sectional view of a modification.

Again referring to the drawings illustrating one of the many constructions of my invention, the numeral 1 designates the bulb carrying the outer screw contact 2 and cen tral contact 3. The filament sections 4 and 5 are both connected to a main lead 6 and that is connected to the central contact 3.

- An auxiliary lead 7 connects one filament manner and for the purpose of illustration I have shown the length of wire 10 having one end fixed to the outer contact and its other end arranged to be wrapped in engagement with the free end 9 as is clearly shown in Fig. 3. i

If found advantageous in practice a recess 11 may be provided in which is coiled the free end 12 of the lead, thereby housing the same until needed.

From the foregoing description taken in connection with the accompanying drawings, it will be seen-that the life of the bulb is greatly extended due to the fact that two filaments are provided, one of which may be rendered operative upon the burning out of the other.

It is, of course, to be understood that the completing of the circuit may be accomplished in various other ways than illustrated and therefore I do not desire to be limited in any manner except as set forth in the claim hereunto appended.

Having thus described my invention, what I claim is:'

An electric light comprising a bulb, an outer contact, an inner contact, a double filament, a main lead connected to both filaments and to the inner contact, an auxiliary lead permanently connecting one filament to the other contact, an auxiliary lead conneeted to the other filament and having its one'end free and means for connecting said free end .to the outer contact, said bulb having a recess for housing the free endof said second auxiliary lead.

Intestimony whereof I aflix my signature.

RICHARD C. ABELT, JR. 

